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Finding the Fourth Proportional to 578.25, 867.20 and 212.94

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Solution

The fourth proportional to 578.25, 867.20 and 212.94 is: 319.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.25 : 867.20 = 212.94 : x
  2. Step 2: Convert to fraction form
    578.25/867.20 = 212.94/x
  3. Step 3: Cross multiply
    578.25x = 867.20 × 212.94
  4. Step 4: Simplify right side
    578.25x = 184,660.50
  5. Step 5: Solve for x
    x = 184,660.50/578.25
  6. Step 6: Final answer
    x = 319.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.